The Exhaust plume is something that piqued my interest as well.The most interesting bit for me was seeing the exhaust plume comparison of V2 and V3. It really communicates how much more power V3 is generating - and serves as a reminder that the more efficient a rocket engine is, the better is works as a weapon. I wonder if the new cooled plate would work with 33 V3 engines firing at it at full power.
Previously we've seen well defined purple-hued plumes with shock diamonds. This is even more apparent in the "waterplate test video" in the other thread.
These appear much less well defined, which I suppose may be due to the more violent exiting as a result of the higher pressure. But the very orangish tint seems out of character for what we've see from a methalox engine...